I definitely recommend a laser color printer. Maybe even led.
And would replace them with all the printers in your organization within the same office.
Based on my experience: the value of "service+consumables" is much lower than the jet. With your print volume, you can estimate that one filling will last for six months.
But make no mistake, because after the printer appears, people begin to indulge in and print everything. So for the first time, stock up on a couple of sets of cartridges.
The copier continues to go up, therefore look in other directions. But pay attention to the print resolution (for booklets better >=600dpi).
The method of calculation is simple: find any struynika and download. Find them consumables, their cost and their resource(!), share, compare the cost of one imprint. For struynika: cartridges for each limit printing and servicing at least once a year. To download it: 4 color cartridge for each limit, print cartridge (photo reel) for every limit (from 10 to 40 thousand prints), the recommended maintenance is once a year or once a month (depends on system).
We used to have in the office was a bunch of different printers (about 20p.), I tired to buy them the toner cartridges and print cartridges. Now the whole office we have two cars, and Xerox WorkCentre 7232 7328. The average cost 260т.R. each, but the one I run once a year, on average, another 2 times. Despite the fact that print mostly colour. Moreover, they are fast: they are able to scan over the network, send an e-mail and faxes, recognize the text, copy packs including the duplex mode. In General, the beauty.